coars·en /ˈkorsṇ, ˈkɔr-/
(vt.)(vi.)(使)變粗
Coars·en v. t. To make coarse or vulgar; as, to coarsen one's character. [R.]
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coarsen
v 1: make or become coarse or coarser; "coarsen the surface";
"Their minds coarsened"
2: make less subtle or refined; "coarsen one's ideals"